Calling line identification apparatus



May 19, 1953 I J. E. osTLINE 2,639,330

CALLING LINE IDENTIFICATION APPARATUS Filed March 4, 1 949 6 Sheets-Sheet 2 FIRST PARTY LINI-:S

\l| Hundred Group SECOND PARTY LINES. \l2 Hundred Group A INV JOHN E. O'STLINE ay l ATTYS FIG. 2

May 19, 1953 J. E. osTLlNE CALLING LINE IDENTIFICATION APPARATUS Filed March 4, 1949 6 Sheets-Sheet 3 YATTYS.

May 19, 1953 J. E. osTLlNE 2,539,330

CALLING LINE IDENTIFICATION APPARATUS Filed MaIOh 4, 1949.v 6 Sheets-Sheet 4 L-Z HUndrGd Group- THTRD PARTY LTNEs L-l?) Hundred Group -J GROUP MARK R455 T4 HUNDRED GROUP FOURTH-gw TO T5 THU T9 AND lO UNE? HUNDRED GROUP A D AGGEss EQUIPMENT. To 25 THRU 29 N 2O HUNDRED GROUP. JNVENTOR. FIG 4 AGGEss EQUIPMENT. JOHN E. OSTLINE Ml 0Q2/M ATTYS.

May 19, 1953 J. E. osTLlNE 2,639,330

CALLING LINE IDENTIFICATION APPARATUS Filed March 4, 1949 6 Sheets-Sheet 5 JOHN E. OSTLINE ATTYS.

May 19 1953 J. E. osTLlNE w 2,639,330

I CALLING LINE IDENTIFICATION APPARATUS Filed March 4, 1 949 s sheets-sheet e CONNECTOR 700 TO SEL.

BANKS ROTARY HOLO OR RLsE CONNECTOR BOO F IG. v8

A sw. on rr wlPER cLOsmO I TO sel..

820 85| 84|; Q BANNS Reao,

FIGIA "e .E HOLO OR ROTAGRY l JNVENTOR.' F|G.|B FIGA F|G.5 JOHN E. osTLlNE F l G. 6 BY ATTYS.

Patented May 1.9, 1495.3

UNITED STATES PATENT ortica CALLING LINE IDENTIFICATION Y APPARATUS John stlne, lChicago, VIll., assignor to Automatic Electric Laboratories, Inc., Chicago, III., a corporation of Delaware Application Match 4, 1949, Serial N0. 79,677'

I, 26 Claims. 1

The present invention relates to telephone systems and, more particularly, to those systems in which line detecting apparatus is required to determine the identication of a calling line. More speciically, the present invention relates to line detecting apparatus adapted to be incorporated in an automatic toll ticketing telephone sysem of the character of that disclosed in the copending application of John E. Ostline, Serial No. 75,985, filed February l2, 1949, that employs line detecting or identifying apparatus of the type disclosed in the Grandstaff Patent No. 2,3875897, granted October 30, 1935. This detecting apparatus operates through a predetermined number of cycles of operation to detect the directory number of the calling subscriber line upon which has' been initiated a toll call requiring the recording of certain items of record information in conjunction therewith.

While this line detecting apparatus incore porated inthe system disclosed in the Ostline application ySerial No. 78,985, filed February 12, 1949, is entirely satisfactory under ordinary 'operating conditions,v it is somewhat slower in performing the line detecting function than is desired since it is designed to count the number of stepsI taken during each cycle of .operation in searching for the particular calling line which is to be identied,

Accordingly, it is an object of the present invention to provide in a telephone. system of the type noted an improved line detector which` is direetively operated substantially instantaneously to identify a calling directory numberv in response tothe application of an identifying poe tential impressed upon the said calling line.

Another' object of thev invention is to provide a gas-filled discharge device individual. to each line oithe' telephone system that has a pair of electrodes which are rerideredl conductive there-I between responsive to the application of an identifying potential applied to' any calling one of the lines.

A further object of the invention is to provide a detector including a gas-filled discharge device for each line of the telephone system which de-k vice will not respond to the ordinary potentials applied thereto during the setting upf of tele' phone connections and which will prevent false identification of a subscriber directory number.

I-t is a further object of the invention to pro-.- vide a detector including gas-nlled discharge devices of the two-element type which devices are economical to manufacture, small in size to facilitate mounting and standard commercial articles available on the market.

It is afurther objectof the invention to pro-` vide a detector comprising a gas-'filled discharge device of the two-element type individual to each line ofl the telephone system and a plurality of f2 settable registers which are controlled in` response to the conductivity of any one of the devices to register) a multi-digit designation corresponding to the directory number of the identified calling station.

Another object of the invention is to provide in an automatic telephone system, including party lines, an improved arrangement for identifying the directory number of the Called stations on the called party lines which is selectively governed by the calling devices atl the various calling party substatonsto render effective only those gasnlled discharge devices which are individual to the corresponding stations on each of the party lines in the telephone system.

AA further object of the invention is to provide in an automatic telephone system, including party lines, which are arranged on a terminalper-station basis, an improved 'detector provided with a gas-filled discharge device for each substation on each of the party lines of the system and which is operated incident to the extension of a connection from a given station on a given party linefto render effective only the gas-filled discharge devices individual to the corresponding stations on all of the party lines, thereby to identify only the given station on the given party line as the calling station.

Another object of the invention is to provide in a telephone system a detector employing,r gasiilled discharge devices of the two-element type for each of the substations on a party line of a telephone system together with control apparatus which is selectively operated in accordance with the' particular one of the calling stations on a multi-party line to provide operating potentials foi'- -the gas-filled disch-arge devices corresponding to the particular calling station on the multieparty line.y

A still further object of the invention is to provide in a telephone system utilizing a detector to identify the directory numbers' of calling subscriber substations an improved connector or final selector arranged to indicate the busy condition' of a subscriber une if the said une is marked busy by the usual busy marking ground or if the said busy line has an identifying marking potential applied thereto for `controlling the operation of the detector.

A still further object of the inventionis to provide in a connector of the type noted above a new and novel busy test circuit arranged to eliminate short-circuiting of an identifying signal applied to a 4busy called line at a time when a connector is attempting to establish a connection with said busy called line.

Further objects and features of the invention pertain to the particular arrangement of the circuit elements of the systen'i,v whereby the above outlined and additional operating features are attained.

The invention, both as to its organizationA and method of operation, together with further objects and advantages thereof, will best be understood by reference to the following specification taken in connection with the accompanying drawings in Which Figs. 1A,`1B and 2 to 5, inelusive, illustrate the apparatus incorporated in an exchange of the telephone system, which apparatus has incorporated therein the features of the invention as briefly outlined above; Fig. v6 illustrates the mode of combining Figs. 1A, 1B and 2 to 5, inclusive, to form a unified system; Fig. '7 illustrates one form of the improved busy test circuit for a conventional connector or final selector utilized in the system; and Fig. 8 illustrates another form of the improved busy circuit for a conventional connector or linal selector utilized in the system. More particularly, Figs. 1A and 1B illustrate schematically a major portion of the apparatus incorporated in the telephone exchange; Figs. 2 to 5, inclusive, illustrate the details of the improved detector provided in the telephone exchange; and Figs. 'l and 8 illustrate respectively the improved busy testing circuit for conventional connectors or final selectors utilized in the exchange.

The general arrangement of the telephone system As disclosed in the previously mentioned copending Ostline application, the automatic toll ticketing telephone system serves a large metropolitan area and the adjacent suburban areas which are divided into a number of zones, each of which includes one or more exchanges. More speciiically, the areas served by the telephone system comprise, among other zones, the zone 35, which zone includes the FLorida 1, FLorida 2 and FLorida 3 exchanges. Each exchange in each zone comprises a 10,000 terminal unit, although it may not be initially installed to serve its ultimate terminal capacity. The lines terminating at each exchange in each zone comprise both private subscriber lines and party subscriber lines. The party subscriber lines are arranged on a terminal-per-station basis thereby to provide separate substation telephone directory numbers for each of the substations on the party lines.

The various exchanges in each zone are interconnected by suitable groups of trunk lines, not shown, and at least one such exchange is interconnected vvith one or more of the exchanges in other zones by suitable groups of interconnecting toll lines. In the automatic toll ticketing telephone system, various local and toll calls are set up by automatic switching apparatus under control of the subscriber substation equipment, including the usual calling device or dial. In order to facilitate the setting up of various connections, a universal numbering scheme is utilized whereby all called subscriber substations in the various exchanges in the various zones are dialed as listed in the telephone directory. Accordingly, the directory number of each subscriber substation in the telephone system comprises a code portion including three digits representing respectively the first two letters of the exchange name and the digit representing the number of the exchange in the zone and a numerical portion including four digits identifying the terminal of the particular station. At this point it is noted that the directory numbers of the party subscriber substations require no suffix digit in View of the fact that all of the party lines are arranged on a 4 terminal-per-station basis and, consequently, each of the stations on each of the party lines is provided with an individual four-digit number identifying the particular terminal of the party station.

It should also be noted at this time that while the apparatus schematically illustrated in Figs. 1A and 1B of the telephone system represents the exchange apparatus located in the FLorida 3 exchange, as shown in the previously mentioned copending Ostline application, it should be understood that the line detecting apparatus illustrated in Figs. 2 to 5, inclusive, can also be utilized to determine the directory numbers of the calling substations in the FLorida 1 and FLorida 2 exchanges as well as those in the FLorida 3 exchange, if the exchange apparatus of the threenamed exchanges are installed in the same telephone exchange building.

The apparatus incorporated in the FLorz'da 3 exchange Preferably, the FLorida 3 exchange in the telephone system comprises apparatus substantially identical with that shown in the previously mentioned copending Ostline application, which apparatus includes, as is shown in Figs. 1A, 1B and 2A to 5, inclusive, automatic switching equipment serving a maximum of 10,000 terminals, one of the terminals terminating the line of the regular subscriber substation TR-3 and four of the terminals commonly terminating the line of the four party subscriber substations TSl-S, TS2-3, 'PS3-3 and Tsd-3. The switching equipment comprises a number of line circuits individually associated with the subscriber lines terminating in the FLorida 3 exchange. For example, the line circuit 405X terminates the line conductors 402K and 403K of the regular subscriber substation 'TR-3 and the line circuit |92 terminates the line conductors |20 and |2| commonly connected to the four party subscriber substations, noted above, of the party line. At this point it is noted that the regular subscriber substation Tft-3 and the party subscriber substations TSI-3, TS2-3, TS3-3 and Tsd-3 are rendered free automatic local telephone service and automatic toll ticketing service to all exchanges in the metropolitan area located outside of the zone containing the FLorida 3 exchange for which charges are automatically established.

Before proceeding further with the description of the apparatus included in the FLorida 3 exchange, it should be noted that the apparatus schematically illustrated in Figs. 1A and 1B is provided with numerical designations identifying the apparatus and that some of these designations are provided with the suffix X In order to facilitate cross-referencing the respective units of equipment with the corresponding equipment shown in the previously mentioned copending Ostline application, like units of equipment in the present application have been given the same numerical designations Ias those appearing in the above-metioned copending application. In addition thereto, the numerical designations of the equipment in the present application are also provided with the suffix X.

The switching equipment in the FLorida 3 exchange also comprises a group of finder switches, including the linder switch 440X, which has access to the line circuits 405K and |02 under control of the common distributor 442K and the finder selecting switch MIX. Each of the nder switches 440X is automatically selected for use in response to a call on any one of the subscriber. lines under control oi the distributor and .associated iinder selector. Each of the finders MDX is individually associated with a primary selector, such as the primary selector 500K and each of the primary selectors, in turn, is provided with a director hunter 850K having acccessto a group of directors including the director' 300X.

Each of the directors in the FLorida 3 exchangeincludes a controller 600K., a code switch HiiiX, a call register itiJX and a coder ISIJX. It should be noted at this point that Athe director may require the translation 'of the code digits'of a called exchange code registered therein in order to route the call over appropriate routing paths to the called exchange and that the 'translation of a called office code may include a diiferent num'- ber of digits having different values from the number and values of the digits constituting the called oiiice code. For performing the translation operation in connection with any call, the telephone exchange is provided with a translator NMX, which is common to all of the directors of the exchange and which may be assigned for the individual use of a director by means of the translator assigner NMX. The translator is only called into use when the director has ascertained that a translation is required and is released and made available to other directors as soon as the translator has registered the translated digits in the director.

Also, the FLorida 3 exchange is provided with a local switch train including the second selector MEX, the third selector 320K and the groups of connectors respectively including the individual connector HQ, the first party connector lll, the second party connector H2, the third party connector H3 and the fourth party connector H13. The group of individual connectors,- including the connect-or H9, have access over their associ- `ated bank contacts to the various individual su'bscriber substations, including the regular subscriber substation 'TR-3 terminating in the Florida 3 exchange. The group of-'nrst party connectors, including the connector H l, lhave access cver the associated bank contacts to the four-*party lines terminating in the BLorida 3 exchange. rThe fourparty lines are multiply connected to the bank contacts of the first, second, third and fourth party connectors l'll'to I i4, inclusive, lso that a connector in each group has access to the party line terminating in its associated Contact bank. The four party connectors are each arranged to transmit ringing currents of a different frequency over a connected party line so that the tuned ringer ateach substation on 'the party line may be selectively signaled in accordance with the frequency of the ringing current transmitted thereto. Y More speciflcally, the irst party connector lil transmits a 16 cycle ringing frequency and will actuate the ringer at the fir-st party substation TSIL. The second party connector H2 will transmit a 33 cycle ringing frequency and will actuate the ringer at the second party substation TS2-3. The third and fourth 'party connectors l 3 and l Hi will respectively transmit 50 cycle and 66 cycle ringing lfrequency to actuate the respective ringers at the third and fourth party subscriber substations TSS- 3 and Tsd-'3. Y

The various connectors or Iiinal selectors of the system are of' conventional construction and' arrangement 'and may be, vfor example, of the type illustrated in Fig. 418- or Telephone Theory and Practicaautomatic switching and auxiliary Equipment by e'mpster B. Miller, published by McGraw-Hill Book Company, Inc., of New York in 19.33, except .that the testing circuit including the C 'wiper of the connectors is modified in accordance with either Fig. L'7 or Fig. 8.

Further, the FLorida `3 exchange is provided with toll ticketing apparatus which comprises a number or groups of ticket repeaters, one ofthe groups .including the ticket repeater 2300K, a detector Istit', a number of tabulators, such as the tabulator 28UOX, a ticket tape punch 2968K, a record tape punch ZQSTX and a date and time unit 132853K. In order to associate one of the tabu-laters with a calling one of the ticket repeaters, there is also provided a tabulator allotter 2893K and a ticket repeater :under 2850K.

There `is also provided in the F'Lorida 3 eX change a call recorder, such as the call recorder ZGQQX, individually associated with each director of the system. In Fig. 1A, various modifications have been schematically illustrated in the block diagram of the call recorder 2066K for the purpose of illustrating the manner in which the call recorder controls the detector |906 illustrated in Figs. 2 to 5, inclusive, of the drawings. The call recorder 23853K also includes schematically illustrated registering apparatus for registering a digit olf the Florida 3 exchange code and the numerical digits `of a directory number of a calling subscriber substation. The manner in which the detector IBBB and the call recorder ilitiX cooperate will be described in detail hereinafter.

In considering the detector lett, shown in Figs. 2 to 5, iifclusive, it i's-noted that `it is cone nected to each of the connector bank terminals of each ofthe subscriber lines terminating in the Florida 3 exchange and that it is commonly associated with each of the call recorders, such as the call recorder MMX, provided in the FLorida 3 exchange.

Each subscriber substation is provided with the usual substation apparatus, including a tele-l phone instrument, a ringer and a calling device or 1ial. The calling devices disposed at the lregular subscriber substations,l such as the substation Tft-3, and at the 'first party subscriber substations on a party line, such as the first party substation TSI-3, are of conventional construction and arrangement. Thecalling devices disposed at the second, third and fourth party subscriber substations, such as TS23, TSS-s3' and Tsd-3, are of the special construction and arrangement of that disclosed in the John E'. Ostline Patent No. 2,410,520, granted November 5, 1946. The special dials of the type disclosed in the `aforesaid patent, in addition to the set of impulsing springs, are provided with a set of cam springs which are utilized to identify the position of the calling subscriber substation on the associated party line whereby one ground impulse is transmitted from the calling second party subscriber substation, two ground impulses are transmitted from the calling third party substation and three ground impulses are transmitted from the calling fourth party substation in a manner more fully explained hereinafter.

The detector met included in the FLorida 3 exchange has access to 10,000 terminals in the connector banks of the loca-l switch train and comprises, as is partially vshown in Figs. 2 tor 5, inclusive, group relays, such as the relay RMU, 10i) group marking relays, such `as' the relay Rl, and 1G0- common group connecting-` relays, such as the relay R225. Each of the group relays is commonly connected through 100 resistors to 100 gas-filled discharge devices. The 100 discharge devices are individually connected to 100 identifying conductors which, in turn, are connected to 100 connector bank contacts terminating a particular 100 line group of subscriber lines. as R210, the 100 group marking relays, such as R215, and the 100 common group connecting relays, such as R225, are divided into ten groups,vcomprising ten group relays, ten group marking relays, and ten common group connecting relays. Since each group relay, such as R210, is common to 100 identifying conductors, each group of ten similar relays will be connected to 1000 identifying conductors. Accordingly, each of the ten groups may then be identified by the hundreds group of connector bank contacts to which the identifying conductors are connected. For example, the group relay R210 is commonly connected to the 100 resistors RI to R1109 and the 100 gas-filled discharge devices G1100 to G1199 terminating the 100 identifying conductors C1100 to C1199, which conductors are individually connected to the connector bank contacts of the hundred subscriber substations Whose directory numbers are 1100 to 1199, inclusive. This group may obviously be designated the 11 hundred group. The group relay R250 is common to the 100 identifying conductors C1200 to C1290, inclusive, and consequently is designated the l2 hundred group. The group relay R410 is common to the 100 identifying conductors C1300 to C1399, inclusive, and is designated the 13 hundred group. The group relay R450 is common to the 100 identifying conductors C1400 to C1499, inclusive, and is designated the 14 hundred group. The remaining six group relays, not shown, are respectively connected to six groups of 100 identifying conductors and are respectively designated 15 hundred group, 16 hundred group, 17 hundred group, 18 hundred group, 19 hundred group, and l0 hundred group. The group relays R230, R210, R430 and R010 are commonly connected respectively to the 100 indentifying conductors C2100 to C2199, inclusive, C2290 to C2299, inclusive, C2300 to C2399, inclusive, and C2400 to C2499, inclusive, and are respectively designated 21 hundred group, 22 hundred group, 23 hundred group and 24 hundred group. The remaining six group relays, not shown, are commonly connected to the corresponding identifying conductors in substantially the same manner as described above and are designated asr the 25 hundred group to 29 hundred group, inclusive, and 20 hundred group. The remaining 80 group relays, not shown, are each commonly connected to 100 identifying conductors and are designated with the 100 group number corresponding to the number of the 100 group of connector bank contacts terminating the identifying conductors. In the above-described manner, each of the 100 groups of identifying conductors are designated by means of the commonly connected group relays With the thousands and hundreds digit representing the hundred group of lines commonly connected thereto.

The detector 1900 also comprises 100 tens and units marking relays respectively designated R00 to R99, inclusive, which are respectively connected to the hundred contacts on each of the 100 common group connecting relays, such as the relays R225, R245, R265, etc. More spe- The 100 group relays, such cically, the tens and units marking re-a lays R00 to R99, inclusive, are, for example, connected to the 100 contacts designated 00 to 09, inclusive, of the common group connecting relay R225 of the 11 hundred group and to the corresponding contacts of each of the remaining 99 common group connecting relays of the detector 1900. One of the tens and units marking relays will be operated when they are connected through the contacts of a common group connect relay to the identifying conductors in order to mark the tens and units digits of the directory number of a calling subscriber line.

Furthermore, the detector 1900 is provided with a group of common relays including the detection complete relay R310, which is operated in series with one of the tens and units marking relays, a common group test relay R320, which is operated in series with any one of the operated group marking relays, a director test relay R330 and a start relay R310. The relays R330 and R310 cooperate to associate the detector 1900 with a call recorder, such as the call recorder 2000K. Furthermore, the detector 1900 is provided With three slow-to-release timer relays R340, R350 and R350 Which are normally in their operated positions and which start to release sequentially as soon as the detector |900 is associated with a call recorder. If the three timer relays noted above restore to normal before the directory number of a calling line has been determined, a detector failure signal will be transmitted to the call recorder and the detector |900 will be disconnected from the associated call recorder so that it may be utilized in detecting the directory number of another calling line.

The detector 1900 is also provided with a call recorder finder 598 Which comprises a rotary stepping switch having fty contacts terminating as many as fifty call recorders. The call recorder finder 598 is utilized to find a call recorder that requires the use of the ,detector 1900 and associates the detector with the call recorder.

Finally, the detector 1900 is provided with four party relays R560, R510, R580 and R590 which are selectively operated in accordance with the position of the calling subscriber on a calling party line. The individual or party 1 relay R560 is also operated in the event that lthe call is initiated on a regular subscriber line since the calling device at al1 of the regular subscriber substations and at all of the rst party subscriber substations on party lines are of conventional construction and arrangement. Each of the four relays selectively control four party control relays R510, R520, R530 and R540 in series Wirth a group control relay R550. A group control terminal block TB502 is provided `and terminates each of the contacts of the multi-contact party control relays R510 to R540, inclusive. The hundred group terminal block TB501 termintes the 100 conductors respectively connected to each of the 100 group relays, such as the relay R210. The various contacts of the multi-contact individual and party control relay R510 are jumpered to fthe various group relays, such as relay R210, containing identifying conductors corresponding to subscriber substations of both the individual and party 1 type. The contacts of the multi-contact party two control relay R520 are jumpered to the group relays, such as the relay R250, terminating identifying conductors corresponding to fthe party two subscriber substations on party lines. The contacts of the party three multi-contact control use and connects the single translator |300X to the director 300X. As a result of this connection, vthe translator is operated in accordance with the three code digits of the called exchange and immediately registers in the coder portion |800X of the director 300X the routing digits which must be utilized by the director 300X in setting up the connection. It will also control the director 300X to thereafter transmit certain of the digits of the called subscriber directory number as registered in the director 300X by the calling subscribed in order to complete the connection to the called subscriber substation. It will also control the director 300X so that the call recorder 2000K individually associated therewith will be utilized to register the directory number of the calling subscriber substation. The translator |300X is now released from the director 300X and made available for use by other directors.

The director 300X now operates to transmit the routing digits registered therein by the translator and then the various digits registered in the call register portion |500X of the director 300X over the director hunter 450K to the primary selector 500X. The primary selector 500K responds to the first digit received from the director 300X and operates to select a corresponding group of trunks and then operates to select an idle trunk in the selected group. For example, the primary selector 500X may operate to select the trunk including the conductors 02305K to C230'|X extending to the ticket repeater 2300K. The next digit transmitted by the director 300X controls the ticket repeater selector (not shown) individually associated with the ticket repeater 2300K, and the ticket repeater selector, in turn, selects'an idle trunk extending in the direction of the desired called exchange. .The remaining digits are transmitted by the director 300X over the above-traced path to the trunk line extending to the next exchange whereby the switching equipment associated with the seized trunk line in the `next exchange operates in accordance with conventional practice to extend the connection to the desired called subscriber substation in the called exchange.

As has been pointed out above, the registration of the called oiiice code digits in the director 300X Will cause the translator |300X to control the call recorder 2000X in order to initiate operations whereby the directory number of the calling subscriber substation may be identied and registered in the call recorder 2000X. During the time that the director 300X is transmitting the various routing digits and digits of the called subscriber number in order to set up the connection, the call recorder 2000X operates to control the detector |900. During vthe time the calling subscriber is dialing the digits of the called subscriber directory number, the director 300X is also operated to register in the call recorder 2000K whether the calling subscriber substation is a regular substation on an individual line or is a party subscriber substation on a Darty line and the number of the station on the party line in the event that the calling substation is on a party line.

Referring to the call recorder 2000K, it will be seen that three party relays are provided which `are respectively designated R2020X, R2030X and R2040X. These relays are selectively operated depending upon the character of the calling subscriber substation. More specically, if

Ithe calling subscriber substation is a regular subscriber substation or is the rst Subscriber Substation on a party line, the three relays R2020X, R2030X and R2040X will remain in their restored positions. If the calling subscriber substation is the second, third or fourth subscriber substation on a party line, the three relays R2020X, R2030X and R2040X will be selectively operated and will be retained in their operated positions. The selection of the three relays named above are respectively controlled by the special cam contacts provided at the second, third and fourth subscriber substations on party lines. In the present example, it will be assumed that all of the relays R2020X, R2030X and R2040X are in their restored positions inasmuch as the call has been originated by the regular subscriber at substation 'IR-3.

When the call recorder 2000K is controlled by the translator |300X, in the manner previvously noted, to start the detector |900, a direct ground potential, normally applied to the conductor C|902X, is removed therefrom and a resistance ground, through the winding of the detector test relay R2||0X, is connected to the conductor C|902X. Simultaneously therewith, a direct ground potential is applied to the conductor C|003X. These conductors extend to the detector |900 and the ground potential applied to the conductor C|903X operates the start relay R310. The substitution of the resistance ground potential for the direct ground potential on the conductor C|002X marks a Contact in the bank of the call recorder nder 508 to indicate that the call recorder 2000K requires the use of the detector |000.

In response to the operation of the start relay R310 the call recorder finder 593 nds the particular call recorder 2000K marked by the substitution of the resistance ground potential for .the direct ground potential on the conductor C|902X. The detector test relay R2| |0X in the call recorder 2000K operates as soon as the call recorder finder 508 is associated therewith and causes the operation of the detector connect relay `RI'SIDX. The last-mentioned relay connects all of the conductors extending to the detector |900 through to various relays and registers in the call recorder 2000X. In response to the last-mentioned relay operation, a ground potential is applied to the conductor C|000X thereby to operate the individual or party one relay R500 in the detector |000. Also, the association of the call recorder 2000K with the detector |900 causes the identification marking relay R|20 in the call recorder 2000X to operate and apply a positive (iO-volt booster battery |24 to the calling subscriber line and, consequently, to the identifying conductor individual thereto, such as the conductor C2 |99, in order to control the detector |000. The detector |000 is directively controlled in accordance with the positive 60 volt booster battery |24 to mark the ve groups of WXYZ marking leads |25 to |20, inclusive, respectively in accordance with the eX- change digit of the calling exchange and the thousands, hundreds, tens and units digits C01'- responding to the connector bank terminal number of the calling subscriber substation. The digits mentioned correspond to the directory number of the calling subscriber substation.

The call recorder 2000K registers the five digits identifying the exchange number and the terminal number of the calling subscriber substation and the detector |000 is automatically disconnected from the call recorder 2000X. 'The call recorder 2000X, in conjunction with the director 309X, transmits:` the identification ofy the calling subscriber substation together WithL other information, in code form, over the director hunt,- er 4502K,` the primary selector MSX to the ticket repeater 239X, which code information represents certain items of record information per taining to the present call andvvhich` is storedin the ticket repeater ZSDDX. At this. DOint it iS noted that the director SMX is so interlocked, that it will not operate to transmit the last numerical digitto complete the setting: upY of the connection to the called subscriber substation', unless the detector wel). has been operated to identify the callingv subscriber substation and the director BMX has been operated to transmit all ofl the code information mentioned to the ticket repeater tllX to be registeredtherein.

However, assuming that the detector- |$0||y registers the identity of the calling subscriber substation in the call recorder MMX' and the directo2. 3830K transmits all of thev code infomation mentioned to the ticket repeater 2386K, the direc` tor tti :2 operates totransmit.` the last numerical digit ofthe called subscriber directory number in order to complete.- thei setting up.- ot the. connection to the called subscriber substation. The detector Iseo is; then: autornati'cally released, from they call recorder- 2890K. withinL a predetermined elapsed time interval after: these units of equipment have been associated, Thev directorv BMX and the associated call recorder ZMQX are automatically released from. association` with the primary selector 5|JB-X as soon as` thev last numerical digit. of the called subscriber directory number has been transmitted.. At; this. time the various items of record information pertaining tol the connection are registeredA inv code torni in the ticket. repeater ZSUQX and' when the subscriber at thev called subscriber substation answers the call, the ticket. repeater' MMX' operates to begin the timing operation in order to establish the time duration of the established connection.

Subsequently, when the subscribers involved in the. established connectiony replacetheir receivers upon the switchhooks of their associated telephone instruments, the switching apparatus involved in theA connection is automatically restored to. normal ina conventional manner; However, the ticket. repeater MMX and the associated ticket repeater selector t'not shown) are not-4 re-l leased since il, is essential that all of the items of information registered in the ticket repeater ESGX, including the established time item, be transferred to a tabulator for the purposeof con'- trolling the ticket tape punch and the record tape punch. Consequently, as soon as the connection is released in the manner notedlv above, the tabulator allotter 286 EX is controlled in order to cause an idle` one of the tabu-lators, such as' the tabulator MMX; to connect itself with they particular ticlset repeater 2368K by way of the ticket repeater finder 2865K. The items-of information pertaining to the established connection are then transferred from the ticket repeater 2'3llfX' to the connected tabula-tor MMX and the ticket repeater 23605( is released'. The tabulator 285393K controls the date and timel unit 132953K and they record andY ticket tape: punch mechanisms whereby the record tape punch mechanism ZSH'iX- and the ticket tape punch. mechanism 2968K arey controlled in order respectively to produce aperforatedtape containing a common record of the various items of record. information andra peric-tv rated tape containing an individual record of the various items: of record information pertaining to the established connection. As soon as the information stored inthe tabulator and the date and time information have been perforated by the respective tape punch mechanisms, the various units of equipment involved in the perforating operations are restored to normal and, thus, made available for additional calls.

In View of the foregoing explanation of the mode of operation of the apparatus incorporated in the telephone system to set up a metropolitan toll' call from the calling regular subscriber Substation 'TR-3 in the FLorida 3 exchange to` a called subscriber substation in an exchange in another zone and to produce perforated tapes whereby a toll ticket and a common record sheet maybe produced of the various items of record information pertaining thereto, it Will be understood that this apparatus is operative in a substantially identical manner to set up a metropolitan toll call kfrom any calling subscriber substation andv to produce perforated tapes containing a record of the various items of record information. For example, the apparatus is operative to set up a metropolitan toll call from any one of the calling party subscriber substations TS1-3, TS2-3, TSB-3 and ISLE-3 connected to the party subscriber line, including the conductors |2l and i2 to a called subscriber substation in an assoelated exchange in another zone and to produce perforated tapes from which a toll ticket and a common record may be made of the various items of record information pertaining thereto. In this connection it is pointed out 'that' when a metropolitan toll call is extended from any one of the calling party subscriber substations TS |-3, TS2-3', TSS-3 and T8Q-3, the director SMX and the associated call recorder ZililllX are selectively controlled by the calling device at the calling party subscriber substation in order to identify the position of the calling party subscriber substation on the associated party subscriber line and to transmit the Aidentiication to the director Stil-X and the call recorder ZllllX. The call recorder 20301K then operates selectively to apply ground potential to one of' the marking conductors ClillX, Ci'il'i, Ci'SlQSX or ClltSX in accordance With the identification of the position of the calling party subscriber substation on the associated party line. More particularly, ground potential is respectively applied to the conductor CilliiX, Ciill'lX, Cl and ClilQX when the calling party subscriber substation is respectively the party subscriber substations Tsi-3, TS2-3, TS3-3 and Tsd-3.

rl'he applicati-on of ground potential to any one of. the conductors CilllSX to ClfiililX, inclusive, governs the operation of the detector will? whereby the directory numbers of the respective calling party subscribe-r substations TSl-S, TS2-3, TSS-3 and TSA-3 are detected as tif-l), i262, i399 and |493.4 The detector then operates to mark the four digits of the numerical portion of the directory number of the calling party subscriber substation upon the groups of WXYZ marking. conductors |25, |21, |28 and |29 and, in addition thereto, marks the group of WXYZ marking conductors |25 in accordance with the calling ex-y change identifying digit in the manner previously explained.

Detailed `operation of the detector 1900 As previously explained in conjunction with the general. operation of the telephone system incident to the setting upf of the connection from the calling regular subscriber substationTft-iV in: the

FLorida 3 exchange to the called subscriber substation in a called exchange in another zone, the call recorder 2000K applies a ground potential to the start conductor C|603X and it substitutes a resistance ground potential for a direct ground potential Ion the hold conductor CISSEX. The application of ground potential to the start conductor CI 903K completes an operating circuit for energizing the winding f the start relay R310 in the detector |900 thereby to cause the latter relay to operate. The substitution of the resistance ground potential for the direct ground potential on the hold conductor C|002X extending to the detector |900 marks the call recorder 290022, associated with the director 300X, as a calling call recorder in the bank contacts of the call recorder nder 593.

Upon operating, the start relay R310- completes, at its contacts BE'Z, a circuit for energizing the finder magnet M595. The circuit for operating the magnet M505 depends upon whether: the associated wiper 50'! is standing on a contact terminating a hold conductor of a call recorder not requiringr the use of the detector |000. If, for example, the conductor C|002X has a direct ground potential applied thereto and the wiper 591 is in engagement with the contact terminating the conductor C|902X, a circuit is completed by way of the contactsJ 372 and 590 and the winding of the magnet M595 to battery. M595 operates over the above-traced circuit and incident thereto interrupts, at the contacts 500, its operating circuit, whereupon the magnet deenergizes and advances the wiper 597 an additional step in the clockwise direction into engagement with the next bank contact. The abovedescribed cycle of loperation will be recompleted each time the wiper 501 engages a contact in its associated contact bank terminating a hold conductor having direct ground potential applied thereto. Also, at its contacts 3H, the start relay R310 connects the grounded winding of the director test relay R330 by Way of the contacts 332 to the wiper 50T. As long as the wiper 50? engages a grounded contact, the director test relay R330 is short-circuited and will not operate. However, as soon as the wiper 59? engages the hold conductor C|002X having a resistance ground potential applied thereto, the nnder magnet M505 will not operate due to the resistance of the director tes'rl relay R2||0X in the call recorder 2000K'.

The relay R2| IEX, however, operates in series with the magnet M505 and the director test relay R330 operates in multiple with the relay R2| |0X and in series with the magnet M595.

As soon as the director test relay R330 operates, at its contacts 334, it completes a locking circuit for the relay R330 and the relay R2| |0X which is in multiple with the contacts 590 of the magnet M505. At its contacts 332, the relay R330 interrupts a point in the normally completed circuit for the relay R360 of the group of timer relays, which relay now begins to slowly restore to normal due to its slow-to-release characteristics. At this point it should be noted that the timer relays R360, R350 and R340 are normally maintained in their operated positions and are arranged to successively restore to normal within a predetermined elapsed time interval. The last timer relay R340, upon restoring, completes, at its contacts 34|, a circuit for registering in the associated call recorder the fact that the detector |900 has failed to identify a calling subscriber directory number in the event that the identification has not been made within the predetermined time interval.

Referring now to the call recorder 2000K, it is The magnet CII noted that when the detector |900 is associated therewith, the detector test relay R2||0X is operated as has been previously pointed out. Upon operating, the relay R2| MIX completes a circuit (not shown) for operating the detector connect relay R|9|0X in order to connect all of the conductors of the call recorder to the detector |900. Incident to the operation of the detector connect relay R|9i0, a circuit is completed from ground by way of the contacts 20M-X and lr'lZZX, the conductor C|906X and the winding of the individual or party one relay R530 to battery. The abovetraced circuit is completed at this time in view of the fact that the call has been initiated .by the calling subscriber at the regular subscriber substation TR-3 and in view of the fact that the three party relays R2020X, R2030X and RBGAUX in the call recorder 2000K are in their restored positions.

In response to the operation of the individual or party one relay R560, at its contacts 56|, it completes a circuit including the winding of the individual and party one control relay R5|0 and the winding of the group control relay R550, which relays now operate in series. The relay R5 0 is a multi-contact relay having a large number of contacts which are closed upon the operation of the relays. Only three of the contacts of the relay have been illustrated in the drawings but as many as 35 of such contacts may be included on the same relay structure. If additional contacts are required, additional relays, such as relay R5|0, may be included in the operating circuit. Upon operating, the relay R5|0 completes a circuit from battery by way of contacts 562, contacts of the operated relay R5|0, terminal of the group control terminal block TB502 jumpered to terminal of the hundred group terminal block TB50| and then to the winding of the group relay R2|0 in the ll hundred group of identifying conductors. The other terminal of the winding of the group relay R2 I0 is multiply connected through the resistors RI |00 to RI |99, inclusive, to one electrode each of the gas-filled discharge devices GI |00 to G| |99, inclusive. The battery potential extended over the above-traced circuit to the winding of the group relay R2|0 is the regular telephone exchange battery having a voltage of approximately 50 volts and having the positive pole of the battery grounded. The symbol for the negative exchange battery as is illustrated at the contacts 562 is used in the drawings to indicate the negative terminal of the 50 volt exchange battery which has its positive terminal grounded. This same symbol is utilized throughout the drawings to indicate the exchange battery described above.

The above description of the manner in which the negative exchange battery is applied to the winding of the group relay R2 l0 in the l1 hundred group of identifying conductors is applied in substantially the same manner to each of the remaining hundred groups of identifying conductors which are connected to individual subscriber lines and to the party one subscriber substations of all party subscriber lines. All of the group relays, such as group relay R2|0 associated with all of the identifying conductors in the groups noted above are prepared for operation at this time in the same manner as the group relay R2|0. For example, battery potential is also extended by way of the contacts 562, contact 2 of relay R5|0, terminal 2 of the group control terminal block TB502 jumpered to the terminal y-21 )of the hundred 'group 'x bl'o'ck TBEU-l to the Winding of 'the g oup R230 o-'f the 2l hundred group identifying feo'r'ij` ductors. The other tern'iial 'of 'the Winding 'oi the relay R230 is multiply conneete'd by Way of the 100 ressit'ors RZIGB to R2i99, inclu ve, to one of the 'electrodes of Ieatin of tlflae'-'iille`d discharge devices G2100 'to G2199-, inclusive, dividually associated With the 100 identif 'fig' conductors G2100 to C2199-, inclusive; The *cire cuits for the remaining 'group' ieays associa en with the hund-red groups of identifying 'conductors corresponding to the individual slibs'criber substatlo'ns or to inst silbseriber stoof-V stations on party lines are eicaetly 'the saine as has been described abovel t v N The group relays associated with the n 'dress groups of identifying conductors e'orie nling to the identifying conductors of the' se ond, tliiid and fourth party subscriber substations are not prepared for operation. Y

When the group `'control relay R is operated in series with tlie individual and party oney control relay H5N1, at its contacts 55h' it appliesv direct ground potential to the oond'uetr g5 GISUIX extending to the call recorder 26002;. This ground potential is further extended Way of the contacts ISI IX of the operated de'-r tector connect relay RISHOX,v the contacts 2i I IX of the operated detector test relay R12! ItlX and the Winding of the identification marking relay RI20 to battery. The operation' of the relay Rizo signals the call recorder 2000K that the' detector i900 is' now in a condition to be operated to identify the terminal number of the calling sub-V 3.53 scriber substation. Upon operating; the relay RIM),- at its contacts I2I and R22,- substitii'tes'a positive 60 volt booster. battery potential for the direct ground potential applied to the condire-toi' GZIZSX. l

A It may be Well to mention at thisrtime tiiat the direct ground potential is, noin'ially applied by Way of the conductor CZIZEX and no?" utilized',l during the course of a" connection; t'or maintain the finder 440K and the line cli-enitT 405K in their operated positions, to busy these units of equipment to other' apparatus having access thereto-and' to apply a busy marking"y ground potential to the connector bankcontacts of all connectors having accessi to th'e terininals oflthe calling ysubscriber line. These circuits extend fromground by Way of the: contacts |21,- the conductor.I C2i-257i,i thel director 300X; the' conductor CM1-IX, theY Wiper 458K 'on the'v die' rector hunter` 45DX the conductor Ci'rtSX, the' primary selector 500K; the conductor C4ll6X,tlie finder. 440K? theoweei theqfidiwtor. CiSIX, the line circuit Mix, the conductor:ofI the connector normals the ca "bl'evllMX'to tilel identifying cond'uc or" (32H39A individual tolftlie subscriber substation andto the contI in the bankso'r all` ror trie;r'idiviziiial;` ii'eetor's, sil'ch a'stl'ie connectorvlfl;

SSO

groene' potent-iai oppliecljtotiiis oiroiiit o siesthe calling subscriber substation to ali oeils iii;l

aii poteii'tiaijis prot/ieee tot; breaking do ii 'th gas-alien oisonafrge ite iii tile de; tester 'lett individual to theoall g subscriber substation 'TR-'13 ose terminal nuinper is lz me. The ciruit path oy'ei' be boosterbattery poteri ai 12u is 'applied to tn identifying oondifietor indivizi ai to the paling` regalar supscrib'er substation may be 'traced rfrein the posit'iye 6o volt booster battery mi, tile vresistor |23?, contacts WQ; the eoniictor CZIESX extending throng-li 4tlie t effector einen .to trie conductor oai-3X; the wipe' isti; or the diifot'or liti-iter liteit, the cond' estoi-2;, the primary selector stair, trie eend etten, tri-eender allan, 'th wiper tatie, the eooe'tiotor entre the lino ooit 45am tile o oiieuotor of the Ae oiieott'i'r normals iii the cable uixttne identifying con; dtioto'r C2199 theiivtnoiigli the table moet to the eamo 20ct fanti the ieit'elianti eieotr'ooie oi" the gaslle'd discharge ce G2 |995; t The right# tiene. elettrone ei trie d io Gais@ is iioi'v ooitiieo'teetto trie nee 'ive harige batter-y of ab: prosimately 5o volts over tiiefpreytoiisly described oiroiiitirieiiidiiig the resist-,criar las and the group relay R230 of the 21 Hundred vgroup of identifying conductors. kThe potential difr'n across the electrodes of the gas-iil-led discharge device Gmail is' now approximatelyilo v'olts thereby oaiis'iiig the gas-nue discharge revite Gelee to visait oowii aria oeoofiieooiitiii'o'tive;

As soon as' the gasfin-led discharge dei/ice Gaite becomes" conti-dotnet trie group' relay i12-3 operates to indicate to, the detto loot that the terminal ii-ui'iiteif' of the calling' siibsentier substation TR'-s itithe' 21 notieren group ofV identifying oor'fidiitors'.- The" gase'lled discharge devices' providediii trie detector [9ct are preferably type' Nei-2 neon glow laipjs nia-nii; factored by' ythe General Elect-rie 'company'.

As soon' asftrie rg'ro'up relay R239' operates; aft' its contactsY 2315` it coinple'te's a'ii obvious ci niiitforj the'h left-narici winding-of trie fioup niark g relayitzaf. As soon as" trie'aboyeitraoeoii olrouit is;v completed; the re jynzsjsf operates to' ojo plete', at its conteo f 236', a; elreiiit for operating the oom-mongroep test rela-y ntic series with' group test r'eiayitiz'ii operates' series tirote-v witii; Upon` opera "iis, trie ooiiiiiioiigroup testrel'ay" R320; at its contacts 32|; prepares al point' in *the7 circuitsv to' be described hereinafter for indio'atingto" the call recorder 2'01'3'0X that the detector rst-u hasfideritiiid tlef directory' number of the calli-iig: siiiosoriper" at substation 'ini-;

As a further resulty oiy the operation of indicating tfie exciia'rig` of tire"t callin-gf exchange codewliicli,V in` tlie` pr tiiedigitipasio A g substation termin tediiiithe Florine e ex'r oll'oiise Accordingly; the ooiit'aets zitti' aridi' tti' of thefrelaynzlt'e al' WXYZ|25 marking conductors in accordance with the digit 3 of the WXYZ code previously shown. The contacts 24| and 240 are respectively connected to the W and Y marking conductors of the WXYZIZE marking conductors to indicate the digit 2 corresponding to the first or thousand digit of the directory number 2199 of the calling subscriber substation 'TR-3. 'I'he contacts 239 and 238 are respectively jumpered to the W and X marking conductors of the WXYZ|21 marking conductors to indicate the digit l of the second or hundred digit of the calling subscriber directory number.

From the foregoing it will be understood that when any calling subscriber having a directory number in the 21 hundred group makes a call, the gas-filled discharge device individual to the particular calling subscriber substation will be rendered conductive and cause the operation of the group relay R230. Consequently, the group marking relay R235 will also operate and mark the group marking conductors WXYZI25 to |21, inclusive, in accordance with the C digit of the called office code and the thousands and hundreds digits of the calling subscriber fourdigit directory number.

The detector |900 having determined a portion of the digits of the calling subscriber directory number, as noted above, must now determine the remaining two digits corresponding to the last two digits of the calling subscriber directory number. Accordingly, as soon as the group marking relay R235 operates, at its contacts 231, it completes an obvious circuit for operating the common group connect relay R245. is illustrated with 100 make contacts designated to 99, inclusive, but it should be understood, for example, that ten relays having ten contacts each or four relays having 25 contacts each may be substituted for the single relay R245 and operated simultaneously to complete circuits through 100 make contacts. Upon operating, the relays R245 will connect through its 100 make contacts the 100 identifying conductors C2100 to C2l99, inclusive, to the 100 tens and units marking relays R00 to R99, inclusive. It should be understood that while only two of the 100 relays have been shown, that is the relay R00 and R99,

the remaining 98 relays are connected in sub-.

stantially the same manner as the above-named relays to the correspondingly designated 98 identifying conductors. It should also be understood that each of the tens and units marking relays are provided with certain make contacts which are closed in response to the operation of any one of the relays to mark the WXYZ marking conductors |28 and |29 in accordance with the tens and units digits corresponding to the designation of the operated relay. It should also be understood that each of the 100 tens and units marking relays R00 to R99, inclusive, are connected by way of the conductors C00 to C99, inclusive, to the correspondingly numbered contacts of each of the common group connect relays, such as the relay R245, associated with each of the hundred groups of identifying conductors. By this means the 100 tens and units marking relays may be individually associated with the 100 identifying conductors in each of the hundred groups of 100 identifying conductors.

As soon as the 100 tens and units marking relays R00 to R99, inclusivel are individually associated with the 100 identifying conductors C2|00 to C2199, inclusive,in response to the operation of the common group connect relay R245,

This relay f the positive 60 volt booster battery |24 connected to the identifying conductor C2|99 is now extended by way of the contacts 99 of the relay R245 and the conductor C99 to the winding of the tens and units marking relay R99 and the winding of the common group relay R9i0 to the negative terminal of the 50 volt exchange battery. As soon as the above-traced circuit is completed, the tens and units marking relay R99 and the common group relay R3 I 0 operate. Upon operating, the relay R99 applies ground potential to the Y conductor of the WXYZ|29 marking conductors to mark these conductors in accordance with the tens digit 9 of the numerical portion of the calling subscriber directory number 2199 and it applies ground potential to the Y conductor of the WXYZ|29 marking conductors to mark these conductors in accordance with the units digit 9 of the numerical portion of the directory number 2199 of the calling subscriber at substation TR1-3.

Referring now to the call recorder 2000K, it will be seen that when the WXYZ marking conductors |25 to |29, inclusive, are marked in code form in accordance with the digits 32199, the relays in the registers WXYZI to WXYZ5, inclusive, will operate in the well-known manner over the operated contacts |9|4X to |92 |X, inclusive, of the relay R|9|0X and will lock, at their operated positions, to store the ve digits noted above until they are subsequently transferred by the director 300X to the associated ticket repeater 2300K.

When the common group relay R3|0, in the detector |900, is operated in series with the tens and units marking relay R99, it completes, at its contacts 3| a circuit for operating the detection complete relay R202|X in the call recorder 2000X. This circuit may be traced from ground by way of the contacts 3| I and 32|, the conductor C|904X extending to the call recorder 2000K, contacts |9|2X, and the winding of the relay R2|20X to battery. The operation of the relay R2|20X signals the call recorder 2900X that the detector |900 has operated in accordance with the directory number of the callingsubscriber substation TR-3 and that it may be released from the call recorder 2000X and thus be made available to other call recorders. Upon operating, the relay R2|20X controls the detector start relay (not shown) in the call recorder 2000X, which relay, in turn, removes the starting ground potential from the conductor C|903X, disconnects the detector test relay R2| |0X from the conductor C|902X, and applies direct ground potential to the conductor C|902X. When the detector test relay R2 |0X is disconnected from the conductor C|902X, the relay restores to normal and opens a point in the circuit (not shown) for the detector connect relay R|9|0X which relay now restores to normal. Upon restoring, the relay R|9|0X opens its contacts |9||X to |925X, inclusive, thereby to disconnect the various conductors of the detector |900 from the call recorder 2090X. As a further result of the restoration of the relay R2| |0X, at its contacts 2| IX, it opens a point in the circuit of the identication marking relay R|20, which relay restores to normal to disconnect the positive 60 volt booster battery |24 from the previously described circuit including the identifying conductor C2|99 and substitutes in place thereof the direct ground busy marking potential which maintains the various switches and relays operated and which maintains the' calling line busy in the connector bank terminals of all connectors having access thereto.v

In the detector |900 the start relay R310 Will restore to normal as soon asA the starting ground is removed from the conductor CI 903K by' the call recorder 20092K. Upon restoring to normal, the relay R313 opens its contacts 31| and 312 to disconnect the director test relay R330 from the circuit including the Winding of the finder mag-n net M595 and to disconnect the circuit including he hold conductor' C |-902'X from the iinde'r magnet M595. The director test relay R330 now re'- storesjto normal and opens, at its contacts 334, a further point in its holding circuit.

It may be Well to mention at this time that the substitutions o1" the direct ground potential for the resistance ground potential on the conductor C 902X will mark the call recorder 2000K as a non-calling call recorder to the call vrecorder nde'r 598. In other Words, if the start relay R310 is maintained in an operated position from another call recorder at the time the call recorder 25002. dismisses the detector |900, the cali recorder nnder 593 Will automatically advance its wipers to associate the detector |900 with another calling call recorder. With the relay R310 maintained in its operated position, the substituted direct ground potential n the conductor C|932X is extended by Way of the Wiper 591, the contacts 312 and 590 to the Winding of the' nnder magnet M595. In multiple With the above-traced circuit the direct ground potential on the conductor C|902X is also extended by Way of the wiper 531, the contacts 312 and 31| andthe Winding of the relay R330 to ground. Accordingly, the director test relay R330 is short-circuited and restores to normal and opens' its locking circuit including the contacts 335. The finder magnet M595 operates when the above-traced circuit iscompleted and interrupts the circuits, at its contacts 596, thereby to cause the magnet to restore and advance the Wiper 591 into engagement with the next contact in its associated contact bank. If the call recorder associated With the next contact is not calling for the detector |900, a direct ground potential will again be encountered' by the Wiper 591 andA cause the cycle of operation to be recompleted. In this manner, the magnet M595 advances the Wiper 591 until it engages the bank contact terminating the call recorder requiring the use of the detector |950.

From the foregoing description of the` operation of the start relay R310, the director test relay R330, :and the call recorder i'inder 593' it should be understood that if no other call recorder requires the use of the detector |900 at the time the call' recorder 2000K dismisses the detector |5950, the relays R310 and R330 Will restore to normal and the call` recorder finder 593' will retain its Wiper 591 in engagement with the hold conductor CI 902K of the call recorder 2005K. It should also be understood that if another call ref cordel* requires the use of the detector |900 at the time it is dismissed by the call recorder' 2000K, the director test relay R330y isi restored toy normal and the start relay R310 is maintained in its operated position by the call recorder requiring the use of the detector |900. In the latter case the magnet M595 of the call recorder' When. the director test relay R330 restoresJ tof l' 22 connai` in the manner previously described, it opens, at its contacts 33|, a point in a circuit including the conductor C`|9|i5X for' indicating that the detector' |905 has failed to identify the' di rectory number of the calling subscriber. The last-mentioned circuit cannot be completed, however, until the timer relays R365, R350 and R340 have lslowly restored to normal in the order noted above before the director test relay R330 has been restored to normal. As a further result of the restoration of the relay R330, at its contacts 332, it completes an obvious circuit for ope erating the timer relay R360 which relay, in turn, will cause the operation of the timer relays R350v and R340. Finally, the relay R330, upon in the locking circuit for the common group test relay R320 and the' iight-hand Winding of the group marking relay R235. These relays restore at this time and interrupt points in various other circuits which will be described hereinafter.

Referring now to the call recorder 2000K, it will be recalled that the restoration of the detector test relay R2| |0X caused the detector connect relays RI 9|0X to restore and disconnect the detector |900 from the call recorder 2009K as previously noted and it caused the identincation marking relay R2|20 to restore to`v normal to substitute a direct ground potential for the positive 60' volt booster battery |24 on the identifying conductor 02H30. As soon as the detector |900 is disconnected from the' cal-l recorder 2000K, the ground potential applied to the' conductor C|9`05X is disconnectedv at the contacts |922X and. causes the individual or party one relay R560 in the detector |930 to restore toA` normal.V Upon restoring, the relay R550, at its contacts 53|, interrupts the circuit for the relays R5I0 and R555 which now restore to' normal. Also, at its conta-'cts 552, the relay R565 disconnects the negative" exchange battery potential from all ofl the contacts of the individual and party one control relay R5|0. The removal of the negative exchange' battery potential from the above-mentioned contacts occurs at approximately the same instant that the positive 60V volt booster battery |24 is re"- moved from the identifying conductor C2i'99. The removal of the negative exchange battery from.. the contacts of the relay R5|0f opens the circuit for the' group relay R230' associated with the 215 hundred group of identifying conductors and it also removes the` negative exchange battery' from all of the other group relays associated with identifying conductors of both' individual subscriber substations and or rst subscriber substations on party lines. At this time, the positive 60.` volt booster battery |25 is removed from the left-hand electrode of thev gas-lilled discharge' device G2199 anda direct ground potential is applied thereto. The right-k handv 4electrode ofthe gas-filled discharge device G2|9`9 has no potential applied thereto since the negative 50 volt' exchange battery has been removed therefrom by the opening ofcontacts- 562". The gas-filled discharge deviceY G2199 isv accordingly rendered non-conductive and the contacts 236 to 243, inclusive. The contacts 236 of the relay R235 interrupts a further point in the previously described locking circuit for the right-hand winding of the relay and the contacts 238 to 243, inclusive, remove the marking ground potentials from the WXYZ marking conductors 125 to 121, inclusive. Finally, at its contacts 237, the relay R235 interrupts the circuit for the common group connect relay R245 which also restores to normal.

Before describing the operations which result from the restoration of the relay R245, it is advisable at this time to explain the possible transitory circuits which may be closed during the interval between the restoration of the relay R230 and the restoration of the relay R245. More particularly, the identifying conductors, such as conductors C2100 to C2199, inclusive, which are connected to busy subscriber lines in the 2l hundred group of subscriber lines will have ground potential applied thereto and the idle subscriber lines will have negative 50 volt exchange battery connected thereto through the winding of the cutoi relay (not shown) in the line circuits of the associated subscriber lines. Since these conductors terminate in the left-hand electrodes of the gas-lilled discharge devices G2100 to G2199, inclusive, a potential difference of approximately 50 volts may appear across electrodes of two or more of the gas-filled discharge devices. However, since the right-hand electrodes of these devices were multiply connected through the resistors, such as the resistors R2100 to R2199, inclusive, each of which is approximately 27,000 ohms, the voltage across any pair of electrodes is insufficient to break down the device and cause it to become conductive. In addition to the foregoing, the ground or resistance battery potential applied to the various identifying conductors C2100 to C2199, inclusive, as noted above, may be extended by way of the contacts of the common group connect relay R245 through the corresponding tens and units marking relays in multiple therewith and the winding of the detection complete relay R310 to battery. However, the tens and units marking relays R to R99, inclusive, and the relay R310 are marginal and are designed not to operate overl a circuit including the 50 Volt negative exchange battery. These relays, as previously` noted, will operate, however, when the positive 60 volt booster battery 124 is connected in series with the negative 50 volt exchange battery. From the foregoing, it will be understood that the various relays and apparatus involved in the circuit for identifying the directory number of a calling subscriber line are specifically designed not to falsely operate in response to the connection of the normal 50 volt negative exchange battery.

When the common group connect relay R245 restores to normal in the manner previously noted, it disconnects the 100 tens and units marking relays R00 to R99, inclusive, from the 100 identifying conductors C2100 to C2199, inclusive. The operated tens and units marking relay R99 restores to normal and the detection complete relay R310 also restores to normal. At its contacts 311, the relay R310 opens an additional point in the detection complete circuit including the conductor C1904X. At this time all of the operated relays in the detector 1900 have been restored to normal except the timer relays R360, R350 and R340 which relays are normally maintained in their operated pci--A sitions. The detector 1900 is now completely released and is available for use by the call recorder portion of other directors in the telephone system.

In view of the foregoing explanaton of the mode operation of the director 1900, it will be understood that it was directively controlled to register the C digit of the calling exchange code and the four digits of the calling subscriber directory number in the call recorder 2000K in response to the application of the positive 60 volt booster battery to the identifying conductor individual to the calling subscriber substation TR-3 Whose directory number is FLorida 3-2199.

In the above description of operation of the detector 1900 it was pointed out that the timer relays R360, R350 and R340 are normally in their operated positions. It will be recalled that when the detector 1900 is associated with the call recorder 2000X, the director test relay R330 operated and, at its contacts 332, interrupted the circuit for the rst timer relay R330 which slowly restored to normal. Also, at the time the director test relay R330 operated, the call recorder 2000K was controlled to apply positive 60 volt booster battery 124 to the identifying conductor C2199 individual to the calling subscriber at substation 'I'R-3. 'I'he application of the booster battery potential to the identifying conductor C2199 first caused the gas-filled discharge device G2199 to break down and this, in turn, caused the sequential operation of the relays R230, R235, R245 and R320. The relay R235, as previously noted, registered the C digit and the thousands and hundred digits of the calling subscriber directory number in the call-recorder 2000K. In response to the operation of the relay R245, the detector 1900 was then controlled to operate the tens and units marking relay R99 and, in series therewith, the detection complete relay R310. The relay R99 registered the tens and units digits of the calling subscriber number in the call recorder 2000X. The operating time of the various relays is exceedingly fast and, consequently, the elapsed time of the detection operation, i. e., from the time the detector is seized by the operation of relay R330 and until detection has been cornpleted, as indicated by the operation of relay R310, is considerably less than the releasing time of the three timer relays R360, R350 and R340. From the foregoing it will be understood that the normal operation of the detector 1900 to register the directory number of a calling subscriber substation Will be completed Well in advance of the restoring time of the three timer relays noted above. However, if, for any reason, the registration of the calling subscriber directory number is not completed, the detection complete relay R310 will not be operated to disconnect the detector 1900 from the call recorder 2000K.

When the slow-to-release timer relay R360 restores to normal after the seizure of the detector 1900. at its contacts 361, it interrupts the circuit of the timer relay R350 which also slowly restores to normal. When the timer relay R350 restores to normal, at its contacts 351, it opens the circuit of the timer relay R340 which slowly restores to normal and, at its contacts 341, applies ground potential to the detection incomplete conductor C1905X. Whenever the relay R340 restores to normal before the detector 1900 has been disconnected from a call recorder 2000K, due to the failure of the detector to register the identity of a, calling subscriber directory number, the abovescriber substations on party lines.

mentioned ground potential will. be applied to the conductor ClEitlSX and thus cause the operation of the detector failure relay RMSGX in the call recorder ZtllX. The relay Rzl'lz upon operating, will register the fact that the detector lt has failed to detect the identity of the calling subscriber substation and it will automatically disconnect the detector i908 from the call recorder Ziilii in order to render the detector [S available for use by other call recorders. Any operated relays in the detector lett. will be restored to normal and the call recorder finder will be operated in the manner previously described to associate the detector 11Std Wit-h an other calling call recorder. As ay further result of the disconnection of the detector lt: from the call recorder MMX the timer relays R350, R350 and Ritt will be reoperated in the manner previously described to prepare the timer to initiate a new time cycle in response tothe association of the detectory [S with another call recorder.

As a further result of the operation of the detector failure relayv REW-IEX, the call recorder Eil-MX, the director tEiX, and the ticket repeater 2300K will be operated in the manner described in detail in the above-nentioned Ostline application to complete a connection from the calling subscriber substation via the finder 446K, the primary selector ElX and the repeater 2359K, to an intercepting operator position.

In view of the foregoing explanation of the mode of operation of the detector Hill@ to detect the directory number of the calling regular subscriber substation 'TR-t in the Florida 3 exchange whose connector terminal number is 2199, it will be understood that the detector ISM is operative in a substantially identical manner to detect and register the directory number of any calling subscribcr substation in the FLorida 3 exchange. For example, the detector lllli' is operative to detect the directory numbers of the calling party subscriber substations TSI-3, TS2-3, TSS-3, Tsd-3 connected to the party subscriber line conductors i 20 and I2? and' having the connector terminal or directory numbers 1199, 1.299, 1399' and 1499. When the calling party subscriber at substation TSA-3, initiates` a metropolitan toll call in the manner previously described, the director 3M?! operates to establish a connection incooperation with the translator 1359K and the call recorder 2903K. Incident to the actuation of the. calling device at. the calling subscriber substation Tsd-3 to register the digits of the called subscriber directory number in the director 3liliX, the cam 183 at the subscriber substation is actuated to transmit three ground pulses over the calling subscriber line thereby to operate the party 2, party 3 and party Ll relays RZllgllX, 32535K and RZFMX and indicate that the calling party Subscriber substation is the fourth station on the calling party line.

Shortly after the registration of the called office code portion of the called subscriber directory number, the detector lt is associated with the call recorder NMX, in the manner previously described, due to the operation of the detector connect relay REBISX. At this time a circuit is completed for operating the party relay RSSB in the detector |990 to indicate that the `calling subscriber identifying potential will be found in one of the groups of 100 identifying conductors connected only the fourth partyV sub- The circuit for operating the party 4 relayy Ril may be traced from ground by Way of the contacts 2t23X, Z'BX, 2842K and lSZBX, the conductor ClSllSX and the winding of the relay RSM to battery. Upon operating, the relay R590, at its contacts 58E, completes a circuit for: operating the party l control relay Rtli and the group control relay R55@ in, series- Y As' a further result of the operation of the relay Ridge, at: its contacts 592', it connects the 50' voltv negative exchange battery to all oi the contacts of the party e control relay RMB and when this relay is operated, as noted above, it extends the. 50 volt negativel exchange battery to the various terminals on the group control terminal block T3502, The upper contact of the: relay Re@ is connected to the terminalv mi ofthe terminal block TBSQZ and. jgumpered to the terminal t6 of the; hundred' group terminal block 'TB-5M. This terminal, in turn, is connected to the. winding ofthe group relay Rt which is common to the gas-lled discharge devices Gl-'lfitil to @fillesA ci the la hundred group of the fourth party substations on party lines. The. other contacts of the party i control relay Rolla: are iumpered at the terminal blocks TBEM and 'IBtZ a similar manner to all. of.' the other group relays, such as: relay Dass, which are associated with identifying conductors correspoirding;y to the fourth party Subscriber substations on party lines in other hundred groups of: lines.

In view of the above description of operation ci? the detector istil, it will be understood that the detectory is prepared to identify.'l directory numbers of only the. fourth party subscriber directory numbers whenever the party c. relays Rte and RMU are. operated. It should be. noted at this time. that. in the event that the party 2 relays R518. and Etat or the party 3 relays R53/:ii and R3a are operated, the. detector l me will be prepared to identify either a second party subscribcr substation or a. third party subscriber substation in substantially the same, manner as has been previously described.

As a further result ofthe association of the detector Istit with the call recorder NMX, the positive 6G volt booster battery t2@ is extended over the previously described circuit to the wiper 26X of the finder MMX and then by Way of the conductor C103, the line circuit M32, the C conductor of the connector normals in the cable llt@ and then to each of the four identifying conductors Cl ld, Ct239, (N399 and (N499 individual to the four stations on the calling party line. The four' identifying conductors noted above are respectively connected to the 11 hundred group, the 12` hundred group', the 13 hundred group and the 14 hundred group of relays in the detector Hille, as is illustrated in Figs. 2 and 4. Accordingly, the positive 60` volt booster battery i214 is applied to the Gilda, the CIESS, the GEMS and the @M99 gasefi-lled discharge devices of the respective hundred groups. However, inasmuch as the negative 50 volt exchange battery has not been connected to the windings of the group relays RZHB, R25@ and R4H) of the 1l, 12 and I3 hundred groups, the application of the booster battery potential to these hundred groups is of no consequence and no identication will take place.

' In the 14 hundred group of identifying conductors, the negative 50y volt exchange battery has been connected through the winding of the group relay R055 to the multiply connected resistors RMQS to lol-M39, inclusive. The application of the positive 60 volt booster battery 24 to the identifying conductor C|499 causes the gasiilled discharge device G|499 to break down and thus complete the operating circuit for the group relay R450. The relay R450, at its contacts 45|, operates the group marking relay R455 and the latter relay, in turn, registers in code form, the C digit 3, the thousands digit l and the hundreds digit 4 in the WXYZI to WXYZ4, inclusive, registers in the call recorder 2000X in the manner previously described. At its contacts 455, the group marking relay R455 completes a locking circuit for itself in series with the common group test relay R320 which also operates. Finally, at its contacts 451, the relay R455 completes an operating circuit for the common group control relay R465 which relay, upon operating, connects the 100- tens and units marking relays R to R90, inclusive, to the 100 identifying conductors C|400 to (N409, inclusive. The remaining operations of the detector |905 are substantially the same as has been previously described and it will be understood that the tens and units marking relay R99 will operate in series with the detection complete relay R3|0 thereby to register the tens digit 9 and the units digits 9 in the WXYZ4 and WXYZ5 registers in the call recorder 2000K and to cause the call recorder 200SX to disconnect the detector |900.

In View of the foregoing, it will be understood that the detector |900 has registered the C digit 3 identifying the exchange number of the calling FLorida 3 exchange and the numerical portion of the directory number of the calling party subscriber substation |499. The subsequent operation of the call recorder 2000X, the director 300X and the ticket repeater 2300X to produce perforated records of the various items of in- `formation pertaining to the telephone connection, including the directory number of the calling subscriber substation, is the same as has been previously described.

Operation of the connector In the previous description of operation it was pointed out that the calling subscriber line was marked as busy in the contact banks of the various connectors having access thereto by the application of a ground potential to the C conductor individual to the calling line, such as the C conductor of the connector normals in the cable 40|. When the directory number of the calling subscriber line is to be identified by the detector |900, the busy marking ground potential, applied -to the conductor noted above, is removed therefrom and the positive 60 volt booster battery |24 is applied thereto. After the identification has been completed by the detector |900, the direct ground potential is again replaced on the C conductor individual to the calling line and the booster battery is removed therefrom.

If another subscriber in the telephone system extends a call by Way of the local switch train, including the second selector 3|5X, the third selector 320X and the connector to a called line at a time when the called line is marked as busy by a direct ground potential, the connector l, which may be a connector of the type disclosed in Fig. 48 in the above-mentioned publication by Kempster B. Miller, will operate in a conventional manner to transmit a busy tone signal to the calling subscriber substation. While such connectors operate entirely satisfactorily in testing a busy called line, it has been found that during the busy testing operation a direct ground potential is momentarily applied to the C Wiper of the connector during the process of completing a locking circuit for the busy relay therein. This locking circuit maintains the connector busy relay operated and thus prevent the connector from establishing a talking connection with the busy called line.

From the above brief description of the busy tes-ting operation of a conventional connector it will be understood that the connectormomentarily applies ground potential to its C Wiper during the time that the busy relay is disconnected from the C wiper and connected to a local locking ground potential. If the positive 60 volt booster battery |24 for identifying purposes is applied to the C conductor and associated identifyng conductor of the busy line during this `momentary period, the direct ground potential momentarily applied thereto by Ithe calling 'connector will short-circuit the booster battery potential and thus interfere with the identification operation of the detector |900. Furthermore, the direct short placed upon the identifying conductor may blow the protecting fuse and thus disconnect the positive 60 volt booster battery identifying potential from the identifying conductor. Further operations of the detector |900 would then be impossible.

In order to prevent false operation of the detector |900 and in order to prevent the shortcircuiting of the booster battery identifying potential, the locking circuit for the busy relay of the connector shown in Fig. 48 of the Kempster B. Miller publication has been modified as is illustrated in Fig. '7 to include an impedance comprising the upper Winding of the busy. relay R130. Another modification for the locking circuit of the busy relay is illustrated in Fig. 8 wherein a resistor 8|4 is included in the circuit between the contact 8|3 and 332. At this time it may be well to mention that if the resistor 8|4 is omitted from the circuit of the connector illustrated in Fig. 8, the connector will then correspond precisely to the conventional connector circuit illustrated in Fig. 48 of the above-mentioned Miller publication.

Referring now to Fig. '7, it will be assumed that a calling subscriber in the FLorida 3 exchange has extended a connection by way of the usual local switch train, including the second selector 3|5X, the third selector 320x to the connector '|00 illustrated in Fig. 7. The connector '|00 will respond -to the next to the last digit of the called subscriber directory number in the usual manner and will raise its wipers T50 to 152, inclusive, to a position opposite a level in the associated bank `contact corresponding to the numerical value of the digit received. The last digit of the called subscriber directory number Will then control the connector '|00 in the usual manner to rotate the Wipers over the Vselected level into engagement with the set of bank contacts terminating the called subscriber line. In the present example it will be assumed -that the wipers '|50 to T52, inclusive, have been positioned into engagement with the bank contacts terminating the the and C conductors of the connector normals in the cable 40| individual to the party subscriber line terminating the party subscriber substations TS|-3, TS2-3, TS3-3 and TS4-3. It will also be assumed that one of the party subscriber substations is engaged in establishing a telephone connection and thatthe positive 60 volt booster battery |24 is appliedto the C conductor in the cable 40| for the purpose of 

